🪚 Adding E2E test infrastructure

[janjakubnanista]

In this PR

Adding container-based E2E testing infrastructure. This consists of:

• Dockerfile that can build this project. If we were not using yarn everywhere I would definitely suggest pnpm because yarn is not capable of installing dependencies based on just the yarn.lock file. This means the whole codebase needs to be copied to the image before yarn install is ran which in turn means that there is no caching of yarn install. Pathetic.
• docker-compose.templates.yaml files that define reusable services. The idea here is to write as little code as possible because who likes code I don't so we'll reuse everything we can
• docker-compose.yaml files for the actual setups

How does it all work together? you might ask, knowing you already.

1. We spin up a bunch of hardhat node processes - see packages/ua-utils-test-v2/docker-compose.yaml
2. Once they are started, we deploy EndpointV2 to them. This is done using an ordinary hardhat deploy script which we'll need to expand with the endpoint configuration - see services/bootstrap in packages/ua-utils-test-v2/dcoker-compose.yaml
3. Once we have deployed everything, we start the tests - see services/test in packages/ua-utils-test-v2/dcoker-compose.yaml
4. Once the tests are done, we exit